Inclosed electric fuse



A. L. EUSTICE INULOSED ELECTR IC FUSE Filed June Zl, 1918 2 sheetssheet1 Mar. 27.; 1923-,

L. EUSTiC E IN Lu ED ELECTRIC FUSE 2 sheets-sheet '2 Filed June 21, 1918pasta Mar. 27, 1923.

UNITED STATES PATENT OFFICE.

ALFRED L. EUSTICE, OF CHICAGO, ILLINOIS.

INCLOSEI) nrncrarq FUSE.

App1ication filed June a1, 1918. Serial No. 241,115.

EUSTICE,

for holding a terminal in place, and has forits object to provide acombined gas-check and terminal-lock end-closure that will 1facilitaterepeated removal and replacing of the parts in properrelations one to 'the others, and thereby adapt the fuse who used as a.renewable fuse.

The several features of the invention may be realized in a number ofdifferent con-- 'structions differing among themselves in details, someof which are illustrated in the accompanying drawings, in which- F ig, 1is :an external view of a complete fusewith one of the two similarlyconstruct-' ed ends in section, and showing one embodiment of theseveral features ofthe invention,

Fig. 2 is an axial section of one end of the fuse, the shell with itstubular attaching head. as preferably employedin all embodiments of theinvention,

tive; I

Fig. 3 isa perspective view of. the combined gas check and terminal-lockemployed in Fig. 1; i i

Fig. 4 is a detailed view minal employed in Fig. 1;

Fig. 5 shows a modified form of locking 'disk;.

Fig. 6 is a detailed view of the ferrule, preferably employed in all ofthe forms;

Figs. 7 and 7" show by opposite perspective views a modifiedconstruction of gascheck or looking disk; r

F'gs. 8 and 8 show by two longitudinal sections a further modificationof'the con-- struction and assembly of terminal blade and disk; f

Fig 9 is a perspective view showing a further modification ofthe'combined' gascheck and terminal-lock;

residing at a seat and centering'guide 2 shown in perspecof the blade.ter

Fig.'l0 shows the terminal preferably employed with thedisk of Fig. 9;

Figs. 11, 11 and 11 show, by plan and two edge views, a furthermodification of the combined gas-check and terminal-lock;

Figs. 12 and 12 are views of a modified form of terminal and a sealingwasher ad-aptedto'"be counter-sunk into the outer shoulder thereof, andwhich may be em-' ployed. in connection with the sealing and lockingdevice of Figs. 11 and 11 and Fig. 13 shows in section, and Figure 13shows in edge elevation the devices of Figs. 11 to 12 assembled.

One'object of the present invention is to adapt a tubular shell made ofsuitable insulating material, such as indurated fiber, to receive thegas-check and terminal-lock endclosure, and to serveindefinitely inconnection therewith, as a housing for renewable fuses, to which end atubular body 1, of insulating material, is provided with a tubular head2 of-metal, formed with a reduced portion 2 screw-threaded into the bodyand forming a bushing therein to resist shrinkage, and with a largerportion 2' affording for any of the end-closures disclosed herein;- theportions 2* and 2* being offset by a shoulder 2 which adapts the head toabut against the body 1. Notches 2 receive corresponding portions of theend-closure to interlock therewith and prevent rotation of theend-closure and the'terminal blade upon the head, and the externalthreads 2 upon the enlargedportion 2 of the head providefor removableattachment of the ferrule 5, which is to confine theend-closure andtheparts which it controls.

The end-closure 3 may take any one of a numberof forms, several of whichare illustrated. herein.- the object is to. provide a convenient means.for embracing and detachably interlocking with the terminal 4, andthrough which the terminal may be centered upon and firmly anchored tothe shell 1, and which, notwithstanding these functions, will aiford asubstantially impervious wall over the end of In connection with each,

and terminal lock have, as their principal characteristics, a dlsk 3,separable or opening up at the terminal into a pair of complementarymembers 3 and 3 recessed to receive the terminal between them,conforming to apertures, shoulders, or other reduced portions of theterminal in a manner tointerlock with the terminal and pre-- vent bothrotation and longitudinal movement thereof, said disk fitting snuglyupon the terminal in a manner to check the passage of gas between theterminal and disk,

so seated upon the head Qand held 'tothe notches 2 thereof as to preventrotation of the disk upon the head, and also affording 'a continuous endwall for the housing, and

presenting a continuous outer surface to the wall of the ferrule 5 whichpresses against it so that-the gas developed in the blowing nationsthereof, as pointed out in the subjoined claims. The claims, therefore,should be looked to ,to ascertain the scope of the invention as well asthe novel details of construction embraced within 'it.

Referring more particularly to the several disclosed embodiments of theinvention.

The terminal if of all the figures has. the

shoulders 4- which are interlocked by the disk 3 in the direction toresist inward thrust of the terminal. In Figs. 4 and 10,

.the terminal is further provided with the P eye 4P that receivesintermediate projections 3 on the members 3 and 3 of the disk, whichprojections meet within the eye and interlockwith the terminal in amanner to -'resist displacement thereof in both axial directions.

In Fig- 9 one of the projections 3 has half of its thickness continuedto provide a bridging extension 3 from the member 3*, that underlies themember 3 and reaches the opposite wall of the shell, thereby in- .suringincreased steadiness of the terminal support.

. In Fig. 4 the terminal is provided with a fixed flange 4 thatunderlies the disk 3 in a manner to confine the disk between the flangeand the shoulders 1 and thereby afi'ord" increased bearing between theparts and provide an inner seal for the joints be-' According to Figs. 3and 5, theends of the joint between the 'members 3 and 3 are lapped at 3to assist in sealing the joint and to miter the parts together againstdisplacement.

In Figs. 9 anclll, the members 3 3 are assembled by halving joints, Fig.9 showing the end walls of the terminal recess provided with extensions3 underlying the member 3", and of a thickness complementary to that ofthe latter so that the upper strata 'alone are complementary as to thearea of the disk, and Figs. 11-11 showing each of the members, 3 3,provided with half laps 3 upon the other at the. ends of the' terminalrecess.

Again, the members 3?, 3", may bewhollyi separable, as shown in Fig. 5,and the surrounding ferrule alone relied upon to hold them togetheraround the terminal; or connected together by hinges 3, as shown inFigs. 7, 7, Fig. 9, and Figs; 1111"; or limited in their separation byslot and pin .connections 3 as shown in Fig. 3. And in so connecting themembers of the disk, they may be hinged directly, oneto the other, assuggested in Figs. 9 and 11, or through the medium of-a base member 6,Figs. 7, 7, essentially in the form of'a ring having an nlargement 6providing a gate to receive the wider portion of the terminal inassembling and with a reduced opening 6* confining the terminal edgewisewhile the mem-. bers 3 3, closed upon the blade, confine it laterally;or the connection of the members 3 3 may be through the medium of a basemember 7 in the form of an outer sealing washer, as shown iii-Fig. 3,upon whic-h are rovided one portion, for instance, the pins, of the slotand pin connections 3, and in which is ,formed a terminal opening '7snugly fitting the larger dimensions of the terminal. lVasher or basemember 7, being continuous, overlaps the joints between members 3' and3* and checks the escape of gas therethrough. It also presents a smoothouter-surface to receive the confining flange ofthe ferrule,-and betterenables the ferrule to pack theend-closure.

The inner sealing flange 4 and outer seal ing'washer 7 will ordinarilybe employed only for'larger' capacity fuses, and to still furthersafeguard against leakage, a soft packing member 8, of leather or othermaterial equivalent for the purpose, may be interposed between the diskmembers 3, 3",

and the base -membe r- 7.

It is not necessary in all instances the inner flange on the terminal orthe eye therein. As suggested in Figs. :8 and 8*- longitudinalinterlocking in the outward direction maybe insured by fitting the disk3 into a groove 4 in one or more faces of the terminal; or, as suggestedin Figs. 12 and 13, additional shoulders 4 may 'be-suitably to have Y inF igures Sand 8 is also suitable for use in Figures 7' and 7. f

As further suggested in Figs. 12 and 12,

in connection with the form of disk shown an upper sealing andsustaining'washer 9- may be employed with an opening 9 'suificienttopass the shoulders 4 as by tipping the washer over them successively,and this washer may be embedded in the under faces of the uppershoulders 45, and. thus avoid the necessity of extending the upperwasherout to the engaging wall of the ferrule. In

all cases, lugs 10 are preferably located on the disk t enter'th'erecesses 2 and hold the disk. and its associated parts from turning onthe shell.

The ferrule 5, ineach instance, is preferably wall 5 through which itclamps the disk and its associated parts upon the end of the shell; alsowithinternalthreads 5 through Which'it engages the external threads ofthe shell (provided by the tubular head). But

the ferrule does not. terminate with its threaded portion 5 but extendsbeyond the same in a lip or apron -5 that provides a battle for thegases and nsures their direcf tion along the wall of the shell insteadof outward. The device end discharge of'gases.

The probable course of the gases of blowing is through notches 2 to thethread spaces of the ferrule and thence through the circuitouspassage'so provided to the space beneath the baflie or apron of theferrule.

What I claim is:

1. In an electric fuse having a shell and a link-supporting terminal; acombined gascheck and terminal-lock end-closure therefor, comprising aferrule and a disk surrounding the terminal and clamped betweeneffectually prevents a wall of the ferrule and the end'of the shell;said disk comprising a pair of separable complementary members meetingat the terminal, interlocking with the terminal I to resist relativerotary and longitudinal movement thereof, andconstructed to provide acontinuous end wall for the shell and a continuous surface through whichthe disk receives the clamping wall of the ferrule, whereby it confinesthe escape of gas mainly to the spaces within" the disk and ferrule. 0

'2. In an electric fuse having a shell and v a link-supporting terminal;a combined gas-check and terminal-lock end-closure therefor, comprisinga ferrule and a disk surrounding the terminal and clamped be tween 21wall of the ferrule and the end of the shell; said disk comprisinga-pair of separable complementary members meeting provlded with annternal engaging tive movement between them; said disk being constructedto provide a continuous end wall for the shell and a continuous-surfacethrough it receives the clamping wall of the ferrule whereby it confinesthe escape of gas mainly to the spaces within 'the disk and ferrule. v

3. In an electric fuse having a shell and a link-supporting terminal; acombined gascheck and terminal-lock end-closure therefor, comprisingv aferrule and a disk surrounding the trminal clamped between a wall of theferrule and the end of the shell; said disk comprising a pair ofseparable complementary members meeting at the terminal, having lug andnotch interlock with the shell to resist its rotation thereon, and ventthe fuse through the wall of the shell within the ferrule, andsaidterminal having an interlock with the disk to resist both rotary andlongitudinal relative movement between them; and said disk beingconstructed to provide a continuous end wall for the shell and acontinuous surface through which it receives the clamping wall of theferrule whereby it confines the escape of gas mainly to the spaceswithin the disk and ferrule.

- 4. In 'an electric fuse having a shell and a link-supporting terminal,a combined gascheck and terminal-lock end-closure therefor, comprising afergule and a. disk surrounding the terminal and clamped between a wallof the ferrule and the end of the shell; said disk comprising a. pair ofseparable complementary members meeting at the terminal, and saidterminal'having a reduced and shouldered portion through which itreceives the members of the disk and provides an interlock therewith toresist both rotary and longitudinal relative movement; and said diskbeing constructed to provide a continuous end wall for the shell and acontinuous surface through which it receives the clamping wallof theferrule whereby it confines the escape of gas mainly to the spaceswithin the diskand ferrule.

5. In an electric fuse having shell and link-supportingterminal; acombined gas:

check and'termin'al-lock end-closure therefor, comprising a ferrule andadisk surrpunding the terminal and clamped between a wall of the ferruleand the end of the shell; siaid disk comprising'a pair of separablecon'lplementary members meeting the terminal, and said terminal having areduced and shouldered portion through which it re ceives the 'membersof the disk and provides an interlock therewith to resist both rotaryand longitudinal relative movement, the

shoulders of the terminal over-lying and, I

sealing the meeting faces of the disk memhers; and said disk beingconstructed to provide a continuous end wall for the shell and acontinuous surface through which it receives the clamping wall of theferrule whereby it confines the escape of gas mainly to the spaceswithin the disk and ferrule.

6. In an electric fuse having a shell and a link-supporting terminal; acombined gascheck and terminal-lock endclosure therefor, comprising aferrule and a disk surrounding the terminal and clampedbetween a wall ofthe ferrule and the end of the shell: said disk comprising a pair ofseparable complementary members meeting at the terminal,- and saidterminal having a reduced and shouldered portion through which itreceives'the members of the disk and provides an interlock therewith toresist both rotary and longitudinal relative movement. the shoulders ofthe terminal over-lying and sealing the meeting faces of the diskmembers; a sealing washer being fitted snugly around the terminal ononeside of the disk and overlying and sealing that portion of themeeting faces of the disk members which extend. beyond the terminal;said disk being constructed to provide a continuous end wall for theshell and a continuous surface through which it receives the clampingwall of the ferrule whereby it' confines the escape of gas mainly to thespaces within the disk and ferrule. v

T. In an electric fuse having a shell and a linlesupporting terminal;combined gascheck and terminal-lock end-closure therefor, comprising aferrule and a disk surrounding the terminal clamped between a all of theferrule and the endof the shell; said disk comprising a base membe and apair of complementary members movably mounted upon said base member andmeeting at and interlocking with the terminal to resist relative rotaryand longitudinal movement thereof; and said disk being construct cd toprovide a continuous end wall for the shell and a continuous surfacethrough which it receives the clamping wall of the ferrule whereby itconfines the escape of gas mainly to the spaces within the disk andferrule.

8. An end-closure for inclosedfuses. having blade terminals. comprisinga base menibcr constructed with an opening to admit the terminalend-wise. and a divided locking disk having its members separable toadmit the terminal between tlltll1; \t,lll(l having projecti'ons forentering recesses of the terminal to interlock he end-closure thercwithithe members of the disk having slot and pin connections with the basemember whereby they are permanently mounted the eon.

9. In an electric fuse ha ing a shell and a link-supporting terminal: aterminal-lock. comprising a disk composedof a pair of separablecomplementary members meeting at the terminal. interlocking with theterminal to resist relative movement thereof, anda circular shouldersecured to the terminal underneath the terminal lock, and substantiallyfitting the bore of the shell, .and thereby serving as a bulk-head forfinely-divided filling material while the latter is being in serted. I

10. A combined end-closure and terminal lock for inclosed fuses.comprising a base memberhaving permanently mounted thereon a diskdivided into relatively movable parts meeting adjacent the terminal,recessed to permit them to receive and close upon the terminal. andhaving connections with the base member which guide them'into propermeeting relation and leave the meeting portions of the disk beyond theedges ofthe terminal'lapped by the base member.

11. In an electric fuse having a shell \and a terminal. a disk forpositioning the terminal upon the shell, comprising a plurality ofcomplementary parts permanently connected together but relativelymovable transversely to the longitudinal axis of the terminal forinterlocking the disk with and disengaging it from the terminal; 12. Ina fuse having a shell and a blade terminal, a disk for positioning theterminal upon the shell comprising a base member and a locking memberpermanently connect ed with and carried by said base member and 'movablethereon intoand out of engagement with the terminal toprevent-separation of the base member therefrom.

13. In a fuse having a shell and a blade terminal. a disk forpositioning the terminal upon the shell comprising a base member and alocking member permanently connected with and carried by said basemember and movable thereon into and'out of engagement with the terminalto prevent separation of the base member therefrom; said base membersurrounding the terminal. and being ass mbled therewith by longitudinalmovement relatively thereto.

14. In a fuse having 'a shell and a blade terminal. a disk forpositioning the terminal on the shell comprising a base member assembledwith the shell by movement longitudinally thereof, and a pair ofcomplementziry disk members permanently connected witl: and carried bysaid base member and movable thereon transversely of the longitudinalaxis of the-terminal to interlock and r lease the latter.

15. In a fuse having a shell and a blade te minal. a disk forpositioning the terminal onthe shell comprising a base member assembledwith the shell byymovement' longitudinally thereof. and a pair ofcomplemcn tary disk members permanently connected :with and carried bysaid base member and movable. thereon transversely of the longitudinalaxis of the terminal to interlock and release the latter; the opposededges of 10 shell; said disk comprising a pair of separablecomplementary members meeting at the terminal, interlocking with theterminal to resist relative rotary and longitudinal movement thereof,and an enlarged shoulder fixed-t0 the terminal on the under side of 15the end-closure, and faces of the disk.

Signed at Chicago, of June, 1918.

sealing the meeting Illinois, this 17th day ALFRED L. EUSTICE.

